Toilet paper roll
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Solution Overview
Problem
Toilet paper produced through laminate embossing results in excessive thickness, making it unsuitable for longer roll products, and reducing basis weight compromises texture such as softness, fluffiness, and smoothness, while adhesive glue contributes to a coarse touch and firm feel.
Innovation Solution
A toilet paper roll with a 2-ply structure, specific roll diameter and density, embossed recesses of varying depths, and the absence of starch and cationized starch, along with enzymatic paper strength agents, to achieve a balance of water absorbency, texture, and comfortable handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laminate embossing technique is used to enhance water absorption and wiping capability, then water absorption capability is improved, but paper thickness becomes too large
Solution Approach 1:
The patent transitions from 2D flat paper structure to 3D embossed structure with recesses and protrusions. The embossed plies create vertical dimensionality with controlled thickness variations, allowing enhanced water absorption in recess areas while maintaining overall roll compactness through the dimensional transformation of the paper structure.
Solution Approach 2:
The embossed structure creates local variations in paper thickness and density. Recess portions provide localized water absorption zones with greater thickness, while protrusion portions maintain structural integrity. This local quality differentiation allows the paper to exhibit high water absorption capability in specific regions without requiring uniform thickness increase throughout the entire paper sheet.
2Length of moving object
If basis weight of each ply is reduced to compensate for larger roll length, then roll length is increased, but texture such as softness, fluffiness, and smoothness deteriorates
Solution Approach 1:
The patent uses composite structure with multiple embossed plies laminated together. Each ply contributes to the overall texture quality while the composite structure enables longer roll length. The combination of multiple plies with embossed surfaces creates a synergistic effect where the collective texture quality compensates for the reduced individual ply basis weight, maintaining softness and fluffiness in the longer roll product.
3Strength
If adhesive glue is used in laminate embossing to enhance strength, then bonding strength is improved, but touch becomes coarse and firm feel increases
Solution Approach 1:
The embossed structure with recesses and protrusions creates a porous-like surface topology that enhances bonding through mechanical interlocking. The recess portions allow adhesive to penetrate and anchor more effectively, while the protrusion portions maintain surface smoothness for comfortable touch. This porous-structured surface enables strong bonding without the coarse feel associated with traditional adhesive applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a toilet paper roll that is highly water-absorbent, offers a sense of security during wiping, maintains sufficient texture, and provides a comfortable touch with a feel of robust firmness, suitable for longer roll lengths.
Implementation Method 1
the toilet paper has first and second recesses of different depths formed by embossing
Data Source
AI summary
Provided is a toilet paper roll which is fit for a longer toilet paper suitable for use for toilets with washing function. The toilet paper roll includes a paper core and 2-ply toilet paper wound thereon, wherein the toilet paper roll has a roll diameter of 120 mm or smaller, a roll winding density of 0.74 to 1.30 m/cm2, and a roll density of 0.12 to 0.18 g/cm3.